I lay or tape the card over the windshield area and trace the frame from inside the car.

Next, cut the pattern 1 or 2 mm larger than the opening. Tape the pattern down to the sheet plastic and cut it out. You want it just a hair larger if it's a curved windshield.

I always cut larger than needed. It's easy to take off, but you can't put back on.

LOTS of test fitting.

If you go to Micheals or Pat Catan's, you can get a sheet of clear plastic that's enough for twenty cars, front, back and in the middle.

It's quick, cheap and fairly easy. I hope this description has been a help. If you have any more questions about working with resins, just let us know.

If not me, one of the other guys here can definitely help. :)

I will be doing this when I make the windows for my Dodge MAGNUM (From the Brochure cbp) sometime in the next couple weeks. I'll try and take some shots of the process, unless someone else here can add to this.

My favorite color is clear. I am also ambidexterous, I can screw up equally well with either hand. I am 53 years old and been building for most of that time. :)